420 HETEROMERA. 
One male example. Rather broader than A. lepturoides; the upper surface more 
opaque, the eyes larger, the thorax larger and less strongly transverse, the rows of 
punctures on the elytra a little more distinct, the pubescence shorter, &c. 
7. Alethia hogei. (Tab. XIX. fig. 10.) 
Elongate, rather narrow, brownish-piceous, dull, the elytra a little more shining, thickly clothed with short 
pubescence. Head very closely and rugosely punctured ; eyes (d ) comparatively small, widely separated ; 
antenne ( ¢ ) rather stout, tapering a little towards the apex, piceo-ferruginous, the base and apex lighter ; 
prothorax small, transverse, moderately convex, the sides slightly rounded, narrowing very little in front, 
and feebly sinuate behind, the hind angles subrectangular, the basal fovese shallow but distinct, the disc a 
little flattened behind but not canaliculate, the surface punctured like that of the head; scutellum sparsely 
punctured; elytra moderately long, subparallel, much wider than the prothorax, finely punctate-striate, 
the punctures placed close together, the interstices very feebly convex, flat on the basal half of the disc, 
and thickly punctured, the punctures scarcely finer than those of the strie; beneath more shining, sparsely 
but not very finely punctured, the metasternum and side-pieces closely and coarsely so; legs fusco- 
ferruginous. 
¢. The lateral lobes of the last ventral segment somewhat spoon-shaped, curved inwards, the apices rather 
blunt and clothed with a few long hairs. (Fig. 10.) 
Length 8 millim.; breadth 25 millim. (¢.) 
Hab. Mexico, Chihuahua city ({ége). 
One example. Shorter than 4. lepturoides, the eyes smaller, the thorax with more 
distinct basal fovee, the elytra relatively shorter, more shining, and more closely and 
not so minutely punctured, the pubescence shorter, &c. 
THEATETES. 
Last joint of the labial palpi broad, triangular; last joint of the maxillary palpi broadly triangular, its apical 
side much the longest; mandibles feebly bifid; antenne stout, moderately long, scarcely longer in the 
male, joint 1 comparatively very long and stout, 2 very short and small, 3 moderately long, longer than 4 
but very much shorter than 1, 4-7 about equal in length, 8-11 each a little longer than 7, 4-10 broad 
and widening a little towards their apex, 11 oblong ovate, 4—6 dilated on the inner side in the male ; 
head rather deeply sunk into the prothorax; eyes transverse, moderately large and somewhat widely 
separated in the male, smaller and more distant in the female ; prothorax short and very broad, strongly 
transverse, distinctly margined at the sides and base, the base strongly bisinuate; scutellum transverse ; 
elytra a little wider than the prothorax, moderately long ; legs very rough and setose, rather short and 
stout ; anterior and intermediate tarsi with the third and fourth joints, and the posterior tarsi with the 
penultimate joint rather feebly lobed beneath in both sexes; prosternum declivous behind and armed with 
a small raised point at the apex; body oblong ovate, pubescent, winged. 
This genus contains a single species from Mexico; it is at once separated from its 
allies by the comparatively very long and stout basal joint of the antenne. 
1. Theatetes basicornis. (Tab. XIX. figg. 11, lla, ¢.) 
Oblong ovate, moderately convex, dull black, thickly clothed with short pubescence. Head densely and rather 
coarsely punctured; prothorax very broad, strongly transverse, rather convex, the sides much rounded 
anteriorly but nearly straight behind, the hind angles subrectangular, the basal foves obsolete, the disc 
unimpressed, the surface densely and rugosely punctured; scutellum closely punctured ; elytra deeply 
striate, the strieze with fine oblong, subconfluent impressions, the interstices feebly convex, almost flat on 
the basal half of the disc, and thickly and asperately punctured ; beneath more shining, coarsely and rather 
